set reports recordsource at runtime

I know that you can set the recordsource of a report at runtime, using something like.

rptProject.recordsource= "Select * from Project"

however, what happens if you do not know the name of the report at design time?

I have several reports which are loaded in to a combo box. The user can then select the report to view. How then do I set the recordsource of the selected report?

What I have so far is:

VB Code:

If IsNull(cmbReports.Value) Then
    MsgBox "You must select one of the reports.", vbOKOnly + vbCritical, conMsgTitle
    cmbReports.SetFocus
Else 'there is a report selected
    DoCmd.OpenReport cmbReports.Value, acViewPreview
End If

Thanks

Francis